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# Neutrinos From Deep Space Detected on Earth

Science & Tech
- 1105 days ago - cbc.ca
High-energy subatomic particles called neutrinos from beyond our solar system have been detected on Earth for the first time ever.
 David C. (25) Friday November 22, 2013, 11:33 pm PeV neutrinos .. fascinating! What, for a comparison, is the energy (of e.g. a gamma-quantum) needed for pair-(i.e. electron-positron)-production? ((damn - i mostly forgot! About 1 MeV?? or is it GeV? I'm confident that not even 1 TeV is needed, let alone a PeV... well that's where WP comes in really handy:)) WP: The rest mass of an electron is 9.11 × 10−31 kg (0.511 MeV) so (e- + e+) pair production starts at 1.022 MeV and a PeV is -- by the famous formular E=m*c**2 -- equivalent to billions of electrons, or ( with, if memory serves, Mp/Me = ~1800) about a million+ of protons And (iaanm) 1 PeV = 0.16 mJ so these neutrinos (assuming a mass(@v=0)equivalent of 1 eV) must be going at X=99.99...(how many more "9"?)...99 % of c .. i wonder if the precision of my pocket calculator (or python or java?) is sufficient to calculate that number? ... No, it isn't, not for straight-forward calculation, for (iaanm) X = SQRT( 1 - 10^-39 ) Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 natasha salgado (715) Friday November 22, 2013, 11:41 pm Where would we be without our wonderful scientists...and Canada is a superb contributor! Thx Michael Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 John B. (194) Sunday November 24, 2013, 2:19 am Thanks Michael for the link to the wonderful article by Ms. Chung (wonderful photos also). This is exciting and hope to hear much more soon. Read and noted. Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Athena F. (131) Sunday November 24, 2013, 3:18 am interesting, thanks Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Kerrie G. (118) Sunday November 24, 2013, 5:14 am Noted, thanks. Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Bob AWAY P. (401) Sunday November 24, 2013, 6:11 am Thanks Michael Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Roger G. (154) Sunday November 24, 2013, 9:24 am noted, thanks Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Theodore Shayne (56) Sunday November 24, 2013, 11:52 am Noted Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Birgit W. (159) Sunday November 24, 2013, 3:34 pm Interesting. Thanks for sharing Michael. Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Franshisca Dearmas (89) Sunday November 24, 2013, 3:49 pm Noted. TY Michael Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Nimue Michelle Pendragon Gaze (339) Sunday November 24, 2013, 6:24 pm Cool :) Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Mitchell D. (137) Sunday November 24, 2013, 6:30 pm VERY cool! Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Lois Jordan (63) Sunday November 24, 2013, 10:49 pm Noted. So interesting! Hope we are kept updated on the findings. Thanks, Michael. Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 DaleLovesOttawa O. (198) Monday November 25, 2013, 8:56 pm Fascinating and intriguing. Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.
 Sergio Padilla (63) Tuesday December 3, 2013, 2:54 pm Cool Why is this inappropriate? Your report has been submitted to Customer Service. Thank you. There was a problem submitting your report. Please try again later.

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